Experimenting in Black and White

The last time I shot in black and white - I couldn't afford colour film - it was that long ago. Now you can blame dkapp for my new interest.
I took shots of a couple of subjects last weekend with the intention of B&amp;Wing them.
The first turned out the way I wanted it -

With the second, I was trying to create an ominous "don't go near the old mine" sort of look, but I just can't get it. I've got shots from various angles, but I just can't get it dark and moody enough. Am I doing something way wrong, or have I just chosen the wrong subject ?View attachment 7368